Question: Which is {twinned administrative body} of {Dortmund} where {start time} is {1981-0-0} ?
Paraphrase: Which is {twinned regulatory body} of {Dortmund} where {begin time} is {1981-0-0} ?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q1295 p:P190 ?s . ?s ps:P190 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1981')) }